120V Heatbed: Difference between revisions
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* | *Ultimaker beds are 500W - - [https://www.aliexpress.com/item/200X240mm-500W-120V-Ultimaker-2-Clone-3D-Printer-Heated-Bed-Keenovo-Silicone-Heater-Pad/32574665339.html?spm=2114.search0604.3.8.418f2e71ATHbuV&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10130_10068_10890_10547_319_10546_317_10548_10545_10696_453_10084_454_10083_10618_10307_537_536_10059_10884_10887_321_322_10103,searchweb201603_6,ppcSwitch_0&algo_expid=6c802c37-3a1e-4049-974f-426d28b2a55c-1&algo_pvid=6c802c37-3a1e-4049-974f-426d28b2a55c&transAbTest=ae803_3] | ||
*8" bed on amazon is $84. [https://www.ebay.com/itm/8-x8-500W-110V-KEENOVO-Silicone-Heater-3D-Printer-Heat-Bed-Digital-Controller/271835537775?hash=item3f4aa9216f:g:u2wAAOSwUdlWdUSM] | *8" bed on amazon is $84. [https://www.ebay.com/itm/8-x8-500W-110V-KEENOVO-Silicone-Heater-3D-Printer-Heat-Bed-Digital-Controller/271835537775?hash=item3f4aa9216f:g:u2wAAOSwUdlWdUSM] | ||
*8" bed on Aliexpress is $45 - [https://www.aliexpress.com/item/Keenovo-Silicone-Heater-3D-Printer-Heater-Better-Replacement-of-Reprap-PCB-Heater-Heatbed-200-200mm-500W/1628343302.html] | *8" bed on Aliexpress is $45 - [https://www.aliexpress.com/item/Keenovo-Silicone-Heater-3D-Printer-Heater-Better-Replacement-of-Reprap-PCB-Heater-Heatbed-200-200mm-500W/1628343302.html] | ||
Revision as of 02:17, 27 April 2019
About
- OSE Reasons for using a nichrome 120V bed are scalability and lower cost for large beds.
- Reason for DIY nichrome beds is clear for larger beds on the basis of cost.
- Sound design is required a safe method:
- Do not use parts that melt at low temperature. Thus, use Nichrome C wire and braided fiberglass insulation.
- For connection, use high temp 200C wire, and simply wind them around each other. But wait... How to Connect Wire to Nichrome Heaters.
Sourcing
Pad
- Ultimaker beds are 500W - - [1]
- 8" bed on amazon is $84. [2]
- 8" bed on Aliexpress is $45 - [3]
- Expensive 12" on amazon - [4]
- Silicone rubber sheet - to 450F - [5] - $6/sf
- 10x10" heatbed aliexpress 500W - $10 - [6]
- 200W 8x8, $13 - [7]
Silicone Rubber Sheet
Double Sided Tape
- $3/sf - [10]
Single Sided Tape
- Kapton tape, 4"x100ft - $25 - [11]
- Enough for 300 small beds (4"), or 33 12" beds.
Coated Nichrome Wire
- Need 30 Ohms of wire, about 10' long
- See Nichrome Wire
Uncoated Nichrome Wire
- Need 30 Ohm resistance for the length of wire at 120V to get 480W, for P=IV, V=IR, I=V/R -> P=V^2/R = 120^2/30 according to Electrical Power Calculator.
High Temp Nichrome in Fiberglass
- Claim of 1200C - [12]
Sleeving
Rope Heater
- Up to 500C - [15]. Description: helical winding around core material, then insulating sleeve.
Helical Nichrome Coil
- Can be stretched - [16]
Carbon Fiber
- Carbon fiber is also used as a heating wire - [17]. Interesting. But it appears it can only do 15W/meter? Why is it limited? Limitation appears to be encapsulating materials - [18]
Example of a DIY Nichrome Heater
- Idea is to wind Nichrome around an inner core, as otherwise, the heater element gets too long. That is just a practical consideration for these types of heaters if running high voltage.
- Here is 31 ga and 19 feet - for 90W - at 115V. [19]
- Here is another at 12V, with 16 gauge - 10' long, going up only to 225C. [20]
.
Derivative for OSE + Calculations
- 31 ga, 19 feet long above
- Power to bring 31 ga up to 2000F is under 4A - so with full 500W, 31 ga wire would probably blow up. [21]. Need to go thicker to handle the power.
- See Electronics Stack Exchange - [22]
Links
- Hackaday article - [23]